EJU Study Examines Exposure to EMF at Work and Brain Tumors
No clear associations were found between occupational exposure to high frequency electromagnetic fields (EMF) and risk of glioma or meningioma, in one of the largest epidemiological studies performed to date and led by ISGlobal, an institution supported by “la Caixa” Foundation. However, the findings highlight the need for further research on radiofrequency magnetic fields and tumour promotion, as well as possible interactions with other frequencies and with chemicals.
High frequency electromagnetic fields are a form of non-ionising radiation and comprise intermediate frequency (3kHz-10MHz) and radiofrequency (10MHz-300 GHz). Based on limited animal and epidemiological evidence, they were declared by WHO’s International Agency for Research on Cancer (IARC) in 2011 as possibly carcinogenic to humans, but few recent studies have provided further evidence regarding exposure at work. “This is the largest study of brain tumours and occupational high-frequency EMF exposure to date”, explains senior author Elisabeth Cardis, Head of the Radiation Programme at ISGlobal.This is a westerbork radio telescope.
Photo by Tim van der Kuip
Despite the major improvements in estimating exposure, this large case-control study provided no clear evidence for a positive association between cumulative high-frequency EMF exposure and glioma or meningioma risk. However, the number of exposed participants was small: only 10% of the participants were exposed to radiofrequencies and less than 1% were exposed to intermediate frequencies, which limited the statistical power to find clear associations, if they exist.
“Our individualised exposure assessment approach is an important improvement over previous efforts to assess high-frequency EMF exposure risks. Although we did not find a positive association, the fact that we observed indication of an increased risk in the group with most recent radiofrequency exposure deserves further investigation,” explains first author Javier Vila. “We also need to investigate possible interactions with other frequencies, and with chemicals,” adds Cardis.
Contacts and sources:
Pau Rubio
Barcelona Institute for Global Health (ISGLOBAL)
Citation: Occupational exposure to high-frequency electromagnetic fields and brain tumor risk in the INTEROCC study: An individualized assessment approach
Environment International
Volume 119, October 2018, Pages 353-365 http://dx.doi.org/10.1016/j.envint.2018.06.038
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